Each of the persons A, B, C, D and E possesses unequal number (<10) of similar items. A, B and C possess 21 items in all, while C, D and E possess 7 items in all. How many items do A and B possess in all?
- (a)15
- (b)17
- (c)18
- (d)Data is insufficient
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Official answer(b) 17